Urogenital System

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urogenital system

[¦yu̇r·ə¦jen·əd·əl ‚sis·təm]
The combined urinary and genital system in vertebrates, which are intimately related embryologically and anatomically. Also known as genitourinary system.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Urogenital System


the aggregation of anatomically and functionally related organs of excretion and reproduction in animals and man.

Invertebrates. The interconnection of excretory and reproductive organs is achieved in various ways in the invertebrates. In acanthocephalans and priapulids, the excretory organs are called protonephridia; these open into the ducts of the gonads. In most polychaetes, in echiurids, and in sipunculids and brachiopods, the gonaducts retain their basic function but fuse with the excretory organs, which thus take on the additional function of transporting the reproductive products. In certain polychaetes, the excretory organs are called metanephridia; these structures serve to transport reproductive products, while the primary gonaducts, called coelomoducts, partially perform an excretory function. In many mollusks, the sole function of the primary gonaducts is to excrete waste products; the secondary ducts of the gonads serve to transport the reproductive products.

Vertebrates. Ova and sperm pass through the ducts of the excretory organs in all vertebrates, including humans. In female animals and in women, the ova are conveyed through the oviducts, which derive from the müllerian duct. In most male fish and in all amphibians, reproductive products are transported through the Wolffian duct, which is usually the ureter as well. In male reptiles, birds, mammals, and men, the primitive kidney, or mesonephros, is transformed into the epididymis and serves to secrete semen; the Wolffian duct is transformed into the deferent duct. The secondary kidney, or metanephros, together with the ureter, which extends from the metanephros, are the essential constituents of the excretory system in amniotes and humans.


Dogel’, V. A. Sravnitel’naia anatomiia bespozvonochnykh, part 1. Leningrad, 1938.
Beklemishev, V. N. Osnovy sravnitel’noi anatomii bespozvonochnykh, 3rd ed., vol. 2. Moscow, 1964.
Shmal’gauzen, I. I. Osnovy sravnitel’noi anatomii pozvonochnykh zhivotnykh, 4th ed. Moscow, 1947.


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
At the time of gonadal differentiation, male and female embryos have indistinguishable urogenital systems consisting of a set of two ducts (Figure 4-10).
Primary mucosal melanoma arises from various organs like the nose and paranasal sinuses, gastrointestinal tract and the urogenital system. Primary mucosal melanoma are rare and account for only 1.4% of all melanomas.
Veterinary Teaching Hospital) assemble 16 chapters by veterinary surgeons from the US, UK, and Australia, covering principles and equipment, surgery on the various abdominal organ systems, portosystemic shunts, the male urogenital system, the female reproductive system, and peritonitis.
This tumour is generally rare in the urogenital system, and except for the kidney, other sites include the bladder, the prostate and the spermatic cord (Argyropoulos et al.; Baumgartner et al., 1976; Chen, 1987; Siemens et al., 1998).
Discoveries about the antiandrogenic mechanisms of action of some contemporary-use chemicals have provided new knowledge about the organization and development of the urogenital system and may provide additional insight into the etiology of hypospadias and direction for prevention.
This is often due to physical changes in the urogenital system. Oestrogen receptors are found in abundance in the genital organs and these keep the system healthy and resistant to infection.
The most frequently encountered anomalies are those of skeleton-musculature, digestive and central nervous systems, whereas disorders of urogenital system, eyes and skin occur less frequently.
It reveals total absence of urogenital system. Liver and spleen appears to be normal.
In the normal embryologic development of the urogenital system, the cranial part of the urogenital sinus is continuous with the allantois, developing into the bladder and pelvic urethra; the bladder dome, posterior walls and part of lateral walls, normally arise from surrounding urogenital sinus mesenchyme.[sup.16] In recent investigation of embryonic development of bladder, Shapiro and colleagues described that bladder morphogenesis is regulated by complex epithelial-mesenchymal signalling events.[sup.17] Failure of these signalling events to occur at specified times result in bladder anomalies.
The 13-hour surgery on Thursday to part the twins' lower abdomen, pelvis, fused urogenital system and lower back was carried out by a team of experts in anaesthesia, urology, orthopaedics, paediatrics, plastic surgery and nursing.